Liquid-fuel burner.



J. E. DUNKLEY.

LIQUID FUEL BURNER. APPLIUATION FILED JAN. 1s, 1911.

993,768.- Patented May 30, 1911.I

ff ff lo" af UNITED sTATEs raTENT OFFICE.

JAMES E. DUNKLEY, OF LOS ANGELES, CALIFORNIA.

LIQUID-FUEL BURNER.

Specicationof Letters Patent.

Patented May 30,1911.

Application iled January 16, 1911. Serial No. 602,904.

To all whom it may concern."

Be it known that I, JAMES E. DUNKLEY, a citizen of the United States, residing at vLos Angeles, in the county of Los Angeles, State of California, ha'veinvented new and useful Improvementsin Liquid-Fuel Burners, of which the following is specification.

This invention relates to a liquid fuel burner of the generator class, having a tube or pipe system in which the liquid fuel, preferably distillate, is vaporized before it is passed into the burner and mixed with air for combustion.

The invention consists in certain novel features and combinations whereby the liquid is thoroughly and uniformly vapor-ized and heated to such an extent that it will burn with a clear blue flame when mixed with air in appropriate proportions# I,flhe general configuration ofthe burner and the peculiar placement-of the vaporiziug pipes are conducive to this end. The pipes are placed around thelmixiug chamber and the flame burns both above and below the pipes; but the pipes are partially sunk within the outer surface of the chamber walls so that they are protected toa certain extent from the greatest heat of the fiame, but are still in the zone of uniform temperature. It is well known that the highest temperature of a flame produced by mixing combustible gas and air is somewhat near the center of the fiame, perhaps closer to the tip of the flame than to the base. The mixing chamber of the burner consequently becomes heated very uniformly by radiated heat; it is not raised to a high temperature at one point and allowed to be quite cool at another. For these reasons it will be seen that the structure described in the following specification is adapted for producing a flame of even qualities and of uniformly efficient combustion.

In the accompanying drawings I have illustrated a form of my invention, which I prefer, in which drawings:

Figure 1 is :a plan of my improved liquid fuel burner. Fig. 2 is a side elevation of the same. Fig. 3 is a longitudinal section of the same. Fig. 4 is a vertical cross section taken on line 4 4 of Fig. 3.

In the drawings 5 designates a base of convenient proportions for supporting my burner, and formed in the manner of a tray -forcatching liquid which may dripl out of the burner and-for holding the liquid used for initial generation. All of these points' are of standard usage and need not be eX- plained in detail.

The body portion of my burner consisfs essentially of an approximately tubular mixing chamber 6 and a mixingv tube 7. The mixing tube starts from the front end of the mixing chamber where it` is cornplctely open, and passes to the center of the mixing chamber where an aperture 8 connects it with the chamber interior. kTube 7 l1s of approximately cylindrical form and projects upwardly into the mixing chamber as is best shownI in Figs. 3 and 4. This brings ,the burnen into more compact form and also places the mixing tube closer to the heat of' the flame, heating the air and gases more efficiently than would otherwise be the case. The lower wall of the mixing tube, as shown at 9 in Fig. 3, slopes slightly downwardly toward the open end, so that any liquid may pass out of the tube into the base. The burn is supported from the base on standards 10 of any convenient de-4 sifn; this featur may be varied at will. Mtixing chamber 3 is provided with openings 11 and 12 at Kfach end, the openin s being normally clos d by screw plugfs. en' ever yit is necessary to clean the inside of the vmixing chamber, these plugs are removed and the interior is again readily aecessible.

Along each side of the mixing chamber a semi-cylindrical depression is formed extending from end to end. Thisdepression is also extended across the back of the chamber. Generating pipes 15 and 16 are placed alongsidethe chamber and sunk about half their diameter in the depressions; Pipes 15 and 16 screw into a fixture 17 at the rear end of the burner.- This fixture comprises a tube 18 which extends across the rear end of the burner and which carries on its ends two cross couplings 19. means of access to pipes 16, 15 and 17 for cleaning. It will be seen that pipes 15 and 16 are supported so that they do notv rest directly on the body portion of the mixing chamber, being supported at each end, at the rear end by ortions 21 of cross couplings 19 land at t 1e front end by straps 22 (as best shown inV Fig. 4).

Vertical slots are cut in the sides 'of the mixingchamber as illustrated at 25. These slots are cut both above and below the pipes 15 andl, but it will be seen thatI they do not extend directly opposite the pipes and Plugs 2O afford.

. the burn er.

beneath them.. This prevents the flame from playing directly on the pipes, passing above, below and around the pipes without impinging upon it. prefer to cut the slots only on the sides of the burner they may be extended over the top as illustrated at a in Figs. 1 and 2.

Pipe 15 extends forwardly from the flame and carries an admission valve of `an approved. design. The liquid fuel enters through this valve and passes along pipe 15, around through fitting `17, back through pipe 1G to a T-fitting 31 at the front end of A plug 32 is provided in T- litting 81 for the purpose of cleaning pipe 1G from its forward end. By the time the fuel reaches the forward end of the pipe 16 it is in its vaporized form. The vapor passes down through branch 33 to valve 34;, whence it is discharged throughnozzle into mixing tube 7. Valve 34 is of the ordinary needle valve design usually used for such purposes. The gases projected into the mixing tube draw a stream of air through the same, the air becoming mixed with the gases to a. certain extent and passing into the mixing chamber. Here the air and gases are thoroughly inter-mingled and distribute themselves at an even pressure over the inbest illustrated in il.

terior ofthe mixing chamber. Escaping through slots 25, the mixed gas and air burns in afiiame extending outwardly and upwardly from the burner. As before noted, the flame does not impinge directly upon the generating pipes, but flows outwardly and upwardly around them as is The generating pipes are heated uniformly once the burner is started. Initial generationy is accomplished in the usual manner by opening the valves and allowing a suliicient liquid to accumulate in base 5, which, when ignited, will produce suticient heat to start the generation of the gases. The flame will then start in the usual manner and the ordinary operation of the burner continues.

Having .described my invention, I claim:

1. 'A liquid fuel burner, comprising an approximately cylindrical mixing chamber having longitudinalv depressions in its outer walls and discharge slots above and below the depressions, a mixing tube extending along the lower side of the mixing chamber Although I and discharging into the same, a generating tube in the said longitudinal depressions, and means for discharging the generated vapor from the generating tube into the mixing tube.

2. A liquid fuel burner, comprising an elongated mixing chamber having longitudinal depressions in its outer walls and discharge openings adjacent the depressions, the bottom walls of the depressions being imperforated, a generating tube in the said depressions, and means for discharging the l vapor generated in the tube into the mixing chamber.

3. A liquid fuel burner, comprising an elongated mixing chamber having longitudinal depressions in its outer walls and discharge openings adjacent the depressions, the bottom walls of the depressions being imperforated, a generating tube in the said depressions, a mixing tube extending along the underside of the generating chamber and discharging thcrcinto near the center thereof, and means for discharging the vapor Generated in the generating tube into the mixing tube.

4. A liquid fuel burner, comprising an elongated approximately cylindrical mixing chamber having longitudinal depressions in its outer side Walls and having discharge slots in its'outer side walls extending both above and below the depressions, the bottom walls of the depressions being imperforated, a mixing tube extending from one end toa point near ythecenter ofthe mixing chamber along its under wall, the mixing tube extending slightly into the mixing chamber, a generating tube in the said depressions and' adapted to forma passage around the sides and rear end of the chamber, an inlet valve adapted to control the admission of fluid to one end of the tube, means connected to the tube on the other end for injecting the generated `vapor into t-he forward end of the air tube.

In witness that I claim the foregoing I have hereunto subscribed my name this 9th day of January 1911.

JAMES E. DUNKLEY. 

